WO2008128419A1 - Composition nettoyante pour l'élimination de résidus de marquage au plasma - Google Patents
Composition nettoyante pour l'élimination de résidus de marquage au plasma Download PDFInfo
- Publication number
- WO2008128419A1 WO2008128419A1 PCT/CN2008/000682 CN2008000682W WO2008128419A1 WO 2008128419 A1 WO2008128419 A1 WO 2008128419A1 CN 2008000682 W CN2008000682 W CN 2008000682W WO 2008128419 A1 WO2008128419 A1 WO 2008128419A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- cleaning solution
- solution according
- citric acid
- cleaning
- Prior art date
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 80
- 239000000203 mixture Substances 0.000 title abstract description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 240
- 239000000243 solution Substances 0.000 claims abstract description 70
- 238000005260 corrosion Methods 0.000 claims abstract description 31
- 239000007979 citrate buffer Substances 0.000 claims abstract description 21
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims abstract description 9
- 239000002904 solvent Substances 0.000 claims abstract description 7
- -1 such as Si Substances 0.000 claims abstract description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 59
- 230000007797 corrosion Effects 0.000 claims description 30
- 239000003112 inhibitor Substances 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 19
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 18
- 229920000642 polymer Polymers 0.000 claims description 18
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 12
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 12
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 11
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 11
- 239000011976 maleic acid Substances 0.000 claims description 11
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 11
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 10
- 229920001577 copolymer Polymers 0.000 claims description 10
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 10
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical group CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 claims description 9
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 claims description 9
- WQGWDDDVZFFDIG-UHFFFAOYSA-N pyrogallol Chemical compound OC1=CC=CC(O)=C1O WQGWDDDVZFFDIG-UHFFFAOYSA-N 0.000 claims description 9
- ALYNCZNDIQEVRV-UHFFFAOYSA-N 4-aminobenzoic acid Chemical compound NC1=CC=C(C(O)=O)C=C1 ALYNCZNDIQEVRV-UHFFFAOYSA-N 0.000 claims description 8
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 8
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims description 8
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical group CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 7
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- 239000000908 ammonium hydroxide Substances 0.000 claims description 6
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- 125000001453 quaternary ammonium group Chemical group 0.000 claims description 6
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N dimethyl sulfoxide Natural products CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 5
- 229940074391 gallic acid Drugs 0.000 claims description 5
- 235000004515 gallic acid Nutrition 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 150000003384 small molecules Chemical class 0.000 claims description 5
- 150000003457 sulfones Chemical class 0.000 claims description 5
- CYSGHNMQYZDMIA-UHFFFAOYSA-N 1,3-Dimethyl-2-imidazolidinon Chemical group CN1CCN(C)C1=O CYSGHNMQYZDMIA-UHFFFAOYSA-N 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical group [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- ZTHYODDOHIVTJV-UHFFFAOYSA-N Propyl gallate Chemical compound CCCOC(=O)C1=CC(O)=C(O)C(O)=C1 ZTHYODDOHIVTJV-UHFFFAOYSA-N 0.000 claims description 4
- 229920002125 Sokalan® Polymers 0.000 claims description 4
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 claims description 4
- 150000001408 amides Chemical class 0.000 claims description 4
- 229960004050 aminobenzoic acid Drugs 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 229960001760 dimethyl sulfoxide Drugs 0.000 claims description 4
- YAMHXTCMCPHKLN-UHFFFAOYSA-N imidazolidin-2-one Chemical compound O=C1NCCN1 YAMHXTCMCPHKLN-UHFFFAOYSA-N 0.000 claims description 4
- 239000004584 polyacrylic acid Substances 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 claims description 4
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 claims description 4
- 150000003462 sulfoxides Chemical class 0.000 claims description 4
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical group [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims description 4
- CUVLMZNMSPJDON-UHFFFAOYSA-N 1-(1-butoxypropan-2-yloxy)propan-2-ol Chemical compound CCCCOCC(C)OCC(C)O CUVLMZNMSPJDON-UHFFFAOYSA-N 0.000 claims description 3
- QWOZZTWBWQMEPD-UHFFFAOYSA-N 1-(2-ethoxypropoxy)propan-2-ol Chemical compound CCOC(C)COCC(C)O QWOZZTWBWQMEPD-UHFFFAOYSA-N 0.000 claims description 3
- RWNUSVWFHDHRCJ-UHFFFAOYSA-N 1-butoxypropan-2-ol Chemical compound CCCCOCC(C)O RWNUSVWFHDHRCJ-UHFFFAOYSA-N 0.000 claims description 3
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims description 3
- SBASXUCJHJRPEV-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethanol Chemical compound COCCOCCO SBASXUCJHJRPEV-UHFFFAOYSA-N 0.000 claims description 3
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 claims description 3
- KFJDQPJLANOOOB-UHFFFAOYSA-N 2h-benzotriazole-4-carboxylic acid Chemical compound OC(=O)C1=CC=CC2=NNN=C12 KFJDQPJLANOOOB-UHFFFAOYSA-N 0.000 claims description 3
- CMGDVUCDZOBDNL-UHFFFAOYSA-N 4-methyl-2h-benzotriazole Chemical compound CC1=CC=CC2=NNN=C12 CMGDVUCDZOBDNL-UHFFFAOYSA-N 0.000 claims description 3
- 239000005711 Benzoic acid Substances 0.000 claims description 3
- NIQCNGHVCWTJSM-UHFFFAOYSA-N Dimethyl phthalate Chemical compound COC(=O)C1=CC=CC=C1C(=O)OC NIQCNGHVCWTJSM-UHFFFAOYSA-N 0.000 claims description 3
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-O Imidazolium Chemical compound C1=C[NH+]=CN1 RAXXELZNTBOGNW-UHFFFAOYSA-O 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 150000008065 acid anhydrides Chemical class 0.000 claims description 3
- 235000010233 benzoic acid Nutrition 0.000 claims description 3
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 3
- 239000012964 benzotriazole Substances 0.000 claims description 3
- 150000001565 benzotriazoles Chemical class 0.000 claims description 3
- 150000001733 carboxylic acid esters Chemical class 0.000 claims description 3
- 229940028356 diethylene glycol monobutyl ether Drugs 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 150000007529 inorganic bases Chemical class 0.000 claims description 3
- JCGNDDUYTRNOFT-UHFFFAOYSA-N oxolane-2,4-dione Chemical compound O=C1COC(=O)C1 JCGNDDUYTRNOFT-UHFFFAOYSA-N 0.000 claims description 3
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 3
- 238000001020 plasma etching Methods 0.000 claims description 3
- 229920000141 poly(maleic anhydride) Polymers 0.000 claims description 3
- JOLQKTGDSGKSKJ-UHFFFAOYSA-N 1-ethoxypropan-2-ol Chemical compound CCOCC(C)O JOLQKTGDSGKSKJ-UHFFFAOYSA-N 0.000 claims description 2
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 claims description 2
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 2
- CAAMSDWKXXPUJR-UHFFFAOYSA-N 3,5-dihydro-4H-imidazol-4-one Chemical compound O=C1CNC=N1 CAAMSDWKXXPUJR-UHFFFAOYSA-N 0.000 claims description 2
- QCAHUFWKIQLBNB-UHFFFAOYSA-N 3-(3-methoxypropoxy)propan-1-ol Chemical compound COCCCOCCCO QCAHUFWKIQLBNB-UHFFFAOYSA-N 0.000 claims description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 2
- 229920002845 Poly(methacrylic acid) Polymers 0.000 claims description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000002577 cryoprotective agent Substances 0.000 claims description 2
- PUTCXBJUWNRWJH-UHFFFAOYSA-N cyclohexa-3,5-diene-1,1,2-triol Chemical compound OC1C=CC=CC1(O)O PUTCXBJUWNRWJH-UHFFFAOYSA-N 0.000 claims description 2
- CCAFPWNGIUBUSD-UHFFFAOYSA-N diethyl sulfoxide Chemical compound CCS(=O)CC CCAFPWNGIUBUSD-UHFFFAOYSA-N 0.000 claims description 2
- XXJWXESWEXIICW-UHFFFAOYSA-N diethylene glycol monoethyl ether Chemical compound CCOCCOCCO XXJWXESWEXIICW-UHFFFAOYSA-N 0.000 claims description 2
- 229940075557 diethylene glycol monoethyl ether Drugs 0.000 claims description 2
- PKHMTIRCAFTBDS-UHFFFAOYSA-N hexanoyl hexanoate Chemical compound CCCCCC(=O)OC(=O)CCCCC PKHMTIRCAFTBDS-UHFFFAOYSA-N 0.000 claims description 2
- 150000002989 phenols Chemical group 0.000 claims description 2
- 150000003009 phosphonic acids Chemical class 0.000 claims description 2
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims description 2
- 239000000473 propyl gallate Substances 0.000 claims description 2
- 229940075579 propyl gallate Drugs 0.000 claims description 2
- 235000010388 propyl gallate Nutrition 0.000 claims description 2
- 159000000000 sodium salts Chemical class 0.000 claims description 2
- 150000005846 sugar alcohols Polymers 0.000 claims description 2
- HHVIBTZHLRERCL-UHFFFAOYSA-N sulfonyldimethane Chemical group CS(C)(=O)=O HHVIBTZHLRERCL-UHFFFAOYSA-N 0.000 claims description 2
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 claims description 2
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims 2
- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical group [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 claims 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims 1
- 150000001735 carboxylic acids Chemical class 0.000 claims 1
- LZXXNPOYQCLXRS-UHFFFAOYSA-N methyl 4-aminobenzoate Chemical group COC(=O)C1=CC=C(N)C=C1 LZXXNPOYQCLXRS-UHFFFAOYSA-N 0.000 claims 1
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 claims 1
- 229920005862 polyol Polymers 0.000 claims 1
- 150000003077 polyols Chemical class 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 14
- 239000002184 metal Substances 0.000 abstract description 14
- 229910052755 nonmetal Inorganic materials 0.000 abstract description 8
- 239000000758 substrate Substances 0.000 abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 4
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003989 dielectric material Substances 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 229920002521 macromolecule Polymers 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- YWYZEGXAUVWDED-UHFFFAOYSA-N triammonium citrate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O YWYZEGXAUVWDED-UHFFFAOYSA-N 0.000 description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 230000000694 effects Effects 0.000 description 9
- 229920002120 photoresistant polymer Polymers 0.000 description 9
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 7
- VYQMXBMNWDFBHM-UHFFFAOYSA-K 2-hydroxypropane-1,2,3-tricarboxylate tetramethylazanium Chemical compound C[N+](C)(C)C.C[N+](C)(C)C.C[N+](C)(C)C.OC(CC([O-])=O)(CC([O-])=O)C([O-])=O VYQMXBMNWDFBHM-UHFFFAOYSA-K 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- YIAQJLVAIQMPBS-UHFFFAOYSA-K CC[N+](CC)(CC)CC.CC[N+](CC)(CC)CC.CC[N+](CC)(CC)CC.OC(CC([O-])=O)(CC([O-])=O)C([O-])=O Chemical compound CC[N+](CC)(CC)CC.CC[N+](CC)(CC)CC.CC[N+](CC)(CC)CC.OC(CC([O-])=O)(CC([O-])=O)C([O-])=O YIAQJLVAIQMPBS-UHFFFAOYSA-K 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 239000012459 cleaning agent Substances 0.000 description 5
- 238000005530 etching Methods 0.000 description 5
- 229910052731 fluorine Inorganic materials 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 239000000872 buffer Substances 0.000 description 4
- 229940069078 citric acid / sodium citrate Drugs 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- LXCFILQKKLGQFO-UHFFFAOYSA-N methylparaben Chemical compound COC(=O)C1=CC=C(O)C=C1 LXCFILQKKLGQFO-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229940079877 pyrogallol Drugs 0.000 description 4
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 230000002528 anti-freeze Effects 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 239000012669 liquid formulation Substances 0.000 description 3
- 150000002843 nonmetals Chemical class 0.000 description 3
- 239000001509 sodium citrate Substances 0.000 description 3
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 150000003863 ammonium salts Chemical group 0.000 description 2
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- 238000004380 ashing Methods 0.000 description 2
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- 229940041929 citric acid / potassium citrate Drugs 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000011086 high cleaning Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 235000010270 methyl p-hydroxybenzoate Nutrition 0.000 description 2
- 239000004292 methyl p-hydroxybenzoate Substances 0.000 description 2
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- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000002798 polar solvent Substances 0.000 description 2
- 239000001508 potassium citrate Substances 0.000 description 2
- 229960002635 potassium citrate Drugs 0.000 description 2
- QEEAPRPFLLJWCF-UHFFFAOYSA-K potassium citrate (anhydrous) Chemical compound [K+].[K+].[K+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O QEEAPRPFLLJWCF-UHFFFAOYSA-K 0.000 description 2
- 235000011082 potassium citrates Nutrition 0.000 description 2
- 238000000992 sputter etching Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 2
- OXHNLMTVIGZXSG-UHFFFAOYSA-N 1-Methylpyrrole Chemical compound CN1C=CC=C1 OXHNLMTVIGZXSG-UHFFFAOYSA-N 0.000 description 1
- NSPYRFXQDUFQOM-UHFFFAOYSA-N 1-ethylimidazolidin-2-one Chemical compound CCN1CCNC1=O NSPYRFXQDUFQOM-UHFFFAOYSA-N 0.000 description 1
- MBDUIEKYVPVZJH-UHFFFAOYSA-N 1-ethylsulfonylethane Chemical compound CCS(=O)(=O)CC MBDUIEKYVPVZJH-UHFFFAOYSA-N 0.000 description 1
- VTRRCXRVEQTTOE-UHFFFAOYSA-N 1-methylsulfinylethane Chemical compound CCS(C)=O VTRRCXRVEQTTOE-UHFFFAOYSA-N 0.000 description 1
- JHFAEUICJHBVHB-UHFFFAOYSA-N 1h-indol-2-ol Chemical compound C1=CC=C2NC(O)=CC2=C1 JHFAEUICJHBVHB-UHFFFAOYSA-N 0.000 description 1
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- BAVYZALUXZFZLV-UHFFFAOYSA-O Methylammonium ion Chemical compound [NH3+]C BAVYZALUXZFZLV-UHFFFAOYSA-O 0.000 description 1
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical class OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- KBZAXEDKZFPFIN-UHFFFAOYSA-N [F].C[N+](C)(C)C Chemical compound [F].C[N+](C)(C)C KBZAXEDKZFPFIN-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000010849 ion bombardment Methods 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- MOVBJUGHBJJKOW-UHFFFAOYSA-N methyl 2-amino-5-methoxybenzoate Chemical compound COC(=O)C1=CC(OC)=CC=C1N MOVBJUGHBJJKOW-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 150000007519 polyprotic acids Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 229920005614 potassium polyacrylate Polymers 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- QSUJAUYJBJRLKV-UHFFFAOYSA-M tetraethylazanium;fluoride Chemical compound [F-].CC[N+](CC)(CC)CC QSUJAUYJBJRLKV-UHFFFAOYSA-M 0.000 description 1
- 150000004072 triols Chemical class 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/265—Carboxylic acids or salts thereof
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/103—Other heavy metals copper or alloys of copper
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/106—Other heavy metals refractory metals
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/42—Stripping or agents therefor
- G03F7/422—Stripping or agents therefor using liquids only
- G03F7/425—Stripping or agents therefor using liquids only containing mineral alkaline compounds; containing organic basic compounds, e.g. quaternary ammonium compounds; containing heterocyclic basic compounds containing nitrogen
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/42—Stripping or agents therefor
- G03F7/422—Stripping or agents therefor using liquids only
- G03F7/426—Stripping or agents therefor using liquids only containing organic halogen compounds; containing organic sulfonic acids or salts thereof; containing sulfoxides
-
- C11D2111/22—
Definitions
- the present invention relates to a cleaning liquid in a semiconductor manufacturing process, and in particular to a cleaning liquid for cleaning a plasma etching residue.
- the application, exposure and imaging of the photoresist layer is a necessary process step for the pattern fabrication of the components.
- the residue of the photoresist layer material needs to be completely removed before the next process step (i.e., after coating, imaging, ion implantation, and etching of the photoresist layer). Ion bombardment in the doping step hardens the photoresist layer polymer, thus making the photoresist layer less soluble and more difficult to remove.
- this layer of photoresist film has been removed using a two-step process (dry ashing and wet etching).
- the first step uses dry ashing to remove most of the photoresist layer (PR); the second step uses a corrosion inhibitor composition wet etch/clean process to remove the remaining photoresist layer.
- the corrosion inhibitor composition can only remove residual polymer photoresist layers and inorganic materials, and cannot damage metal layers such as aluminum layers.
- Typical cleaning solutions in the prior art are as follows: amine cleaning solution, semi-aqueous amine based (non-hydroxyl amine) cleaning solution and fluoride cleaning solution.
- the first two types of cleaning liquids need to be used at high temperatures (generally between 60 ° C and 80 ° C), and there is a problem of large metal corrosion rate; however, existing fluoride-based cleaning liquids also have some defects, such as Corrosion of metal and non-metal substrates cannot be controlled at the same time, and the channel feature size is changed due to the large etching rate, which further leads to a change in the semiconductor structure and a relatively small cleaning operation window.
- US 6,828,289 A cleaning solution comprising: an acidic buffer, an organic polar solvent, a fluorine-containing substance and water, and having a pH between 3 and 7, wherein the acidic buffer is composed of an organic carboxylic acid or a polybasic acid Ammonium salt group.
- the composition ratio is between 10:1 and 1:10, but it is emphasized that it cannot contain ethylene glycol organic solvents.
- US 5,698,503 discloses a fluorine-containing cleaning liquid which uses a large amount of ethylene glycol, which has a large viscosity and surface tension, thereby affecting the cleaning effect. No.
- 5,972,862 discloses a fluorine-containing cleaning liquid comprising a fluorine-containing substance, a weak acid, a weak base and an organic polar solvent, having a pH of from 7 to 11, and since it does not contain a buffer system, the cleaning effect is unstable and various problems exist.
- the inhibitors used are usually catechol and pyrogallol. These inhibitors cannot simultaneously control the etching rate of metals and oxides; they are also harmful to the environment and human health.
- the purpose of the invention is to solve the problem that the cleaning effect of the existing ion etching residue cleaning liquid is not good or unstable, the corrosion of the substrate is large, the operation window is small, and the environment is polluted, thereby providing a strong cleaning ability.
- the cleaning solution of the present invention contains the following components: a citric acid/citrate buffered aqueous solution, a polymeric corrosion inhibitor, a cryoprotectant, a fluoride, and a solvent.
- the content of the citric acid/citrate buffer aqueous solution in the cleaning solution is preferably 15% to 56% by mass; and the content of the polymer corrosion inhibitor is preferably 0.0001% by mass. 10%; the content of the antifreeze agent is preferably 0.0001% to 10% by mass; The content of the fluoride is preferably 0.01% to 3% by mass; and the mass percentage of the solvent is preferably 40% to 80% by mass.
- the citric acid/citrate buffer aqueous solution preferably has a mass percentage of citric acid and citrate of from 5% to 60%, more preferably from 10% to 50%.
- the citrate is preferably a salt of citric acid formed with an inorganic base or a quaternary ammonium hydroxide; wherein, an inorganic base such as ammonia water and potassium hydroxide, a quaternary ammonium hydroxide such as tetramethylammonium hydroxide and Tetraethylammonium hydroxide and the like.
- the polyfunctional citric acid/citrate buffered aqueous solution not only has a buffering function, but also has a strong chelating ability and an ability to clean inorganic residues.
- the polymer corrosion inhibitor is preferably selected from one or more of a hydroxyl group-containing polymer and a carboxyl group-containing polymer.
- the hydroxyl group-containing polymer is preferably a hydroxyl group-containing polyether or polyvinyl alcohol; and the carboxyl group-containing polymer is preferably a carboxyl group-containing polyether, polymaleic anhydride, polyacrylic acid, or polymethyl group.
- the polymer corrosion inhibitor in the cleaning liquid formulation of the invention can be used as a corrosion inhibitor, a surfactant or a chelating agent, and is harmless to the environment and human body, and avoids the traditional corrosion inhibitor, such as catechol Contamination with pyrogallol, etc., and it also has a good corrosion inhibition effect on metals and non-metals.
- the antifreeze agent may be selected from the group consisting of polyhydric alcohols such as ethylene glycol and propylene glycol in glycols, glycerol in triols, and pentaerythritol in tetrahydric alcohols.
- polyhydric alcohols such as ethylene glycol and propylene glycol in glycols, glycerol in triols, and pentaerythritol in tetrahydric alcohols.
- the antifreeze is preferably used in an amount of 0.0001% to 10% by mass; a smaller amount of the antifreezing agent on the surface of the cleaning liquid.
- a preferred salt of the fluoride is hydrogen fluoride and hydrogen fluoride is formed with a base or more, such as HF, N3 ⁇ 4F, N (CH3) 4 F or N (CH 2 OH) 3 HF, etc. .
- the base is preferably ammonia water, quaternary ammonium hydroxide or alcohol amine.
- the solvent may be selected from one or more of sulfoxide, sulfone, imidazolidinone, pyrrolidone, imidazolidinone, amide and ether.
- the sulfoxide is preferably diethyl sulfoxide or methyl sulfoxide
- the sulfone is preferably methyl sulfone, ethyl sulfone or sulfolane
- the imidazolium is preferably 2-imidazolium, 1,3-dimethyl-2-imidazolium or 1,3-diethyl-2-imidazolium
- the pyrrolidone is preferably N-methylpyrrole a ketone
- the imidazolinone is preferably 1,3-dimethyl-2-imidazolidinone (DMI)
- the amide is preferably dimethylformamide
- Ethylene glycol monomethyl ether ethylene glycol monoethyl ether, ethylene glycol monobut
- the cleaning solution of the present invention may further contain a small molecule inhibitor, preferably in an amount of less than or equal to 10% by mass.
- the small molecule inhibitor may be selected from phenols such as phenol, 1,2-dihydroxyphenol, p-hydroxyphenol or pyrogallol; carboxylic acids such as benzoic acid, p-aminobenzoic acid (PABA), Phthalic acid (PA) or gallic acid (GA); carboxylic acid esters such as methyl paraben, methyl phthalate or propyl gallate; acid anhydrides such as acetic anhydride or hexanoic anhydride Et.; benzotriazoles, such as benzotriazole, methylbenzotriazole or 4-carboxybenzotriazole; phosphonic acids such as 1,3-(hydroxyethyl)-2, 4,6-triphosphonic acid (HEDPA), aminotrimethylenephosphonic acid (ATMP) or 2-phosphonic acid butyl phosphonium-1,2,4-tricarbox
- the cleaning liquid of the present invention can be used simply by uniformly mixing the above components.
- the cleaning solution can be used in a variety of cleaning instruments and cleaning methods such as batch immersion, batch rotary or single-chip rotary processors.
- the cleaning solution of the invention can be used in a large temperature range, generally at room temperature
- the reagents and starting materials used in the present invention are commercially available.
- the medium ion etching residue has a high cleaning efficiency.
- a multifunctional citric acid/citrate buffer aqueous solution is adopted, which not only has a buffering function, but also has a strong chelating ability, and ensures the efficiency and stability of the cleaning liquid cleaning effect.
- the cleaning solution of the present invention has a low ratio to non-metal and metal substrates such as Si, Si0 2 , tetraethoxysilane silica (PETEOS), low dielectric materials, Ti, A1 and Cu, etc. Etching rate.
- the cleaning liquid of the present invention can be used over a wide temperature range, and is generally used in the range of room temperature to 45 ° C, thereby avoiding the high metal corrosion rate in the prior art due to the high use temperature.
- the polymer corrosion inhibitor used in the cleaning liquid formulation of the invention can simultaneously perform good corrosion inhibition on metals and non-metals.
- the cleaning liquid of the present invention is safe to the environment and human body, and has no pollution hazard.
- the cleaning solution of the invention adopts a polymer corrosion inhibitor, which has high-efficiency corrosion inhibition effect, and is also non-toxic to the environment and the human body, and avoids the use of traditional corrosion inhibitors such as catechol and pyrogallol. Pollution hazard.
- the cleaning liquid of the invention has excellent low temperature resistance, can be stored at -18 ° C for two months without freezing, and the antifreeze has a great influence on the surface tension and solution viscosity of the cleaning liquid in its preferred dosage range. small, It does not affect the cleaning performance of the wafer, and it has no corrosive effect on the substrate. Summary of the invention
- the content of citric acid and ammonium citrate is 5% by mass, and the content ratio of citric acid to ammonium citrate is 10:1.
- the content of citric acid and tetramethylammonium citrate is 60% by mass, and the content ratio of citric acid to tetramethylammonium citrate is 1:1.
- citric acid/tetraethylammonium citrate buffer the content of citric acid and tetraethylammonium citrate is 10% by mass, and the content ratio of citric acid to citric acid tetraethylene hinge is 1:30.
- citric acid/potassium citrate buffer solution the content of citric acid and potassium citrate is 50% by mass, and the content ratio of citric acid to potassium citrate is 10:1.
- citric acid/sodium citrate buffered water solution 3%% hydroxyl-containing polyethyl ether (molecular weight 1000), 2wt% carboxyl group-containing polyether (molecular weight 1000), 0.0001% ethylene glycol, 0.5wt% hydrogen fluoride, 0.5% fluorine Tetramethylammonium, 1% acetic anhydride and 62.9999 wt% 2-imidazolium.
- citric acid/sodium citrate buffer the content of citric acid and sodium citrate is 20% by mass, and the ratio of citric acid to sodium citrate is 20:1.
- citric acid/ammonium citrate buffered water solution 40wt% citric acid/ammonium citrate buffered water solution, 0.001wt% polymaleic anhydride (molecular weight 600), lwt% ethylene glycol, lwt% N(CH 2 OH) 3 HF, 1 ⁇ % hydrogen fluoride, lwt% gallic acid Ester and 55.999 wt% methyl ethyl sulfoxide.
- the content of citric acid and ammonium citrate is 40% by mass, and the content ratio of citric acid to ammonium citrate is 10:1.
- citric acid/ammonium citrate buffered water solution 50wt% citric acid/ammonium citrate buffered water solution, 0.01% polyacrylic acid (molecular weight 700), 0.001% by weight of ethylene glycol, 2wt% hydrogen fluoride, 5wt% methyl phthalate and 42.989wt% l, 3-dimethyl Base-2-imidazolium.
- polyacrylic acid molecular weight 700
- the content ratio of citric acid to ammonium citrate is 25:1.
- the content of citric acid and ammonium citrate is 25 wt% by mass, and the content ratio of citric acid to ammonium citrate is 10:1.
- citric acid/ammonium citrate buffered water solution 0.1%% acrylic acid copolymer with maleic acid (molecular weight 1000), 0.1wt% ethylene glycol, 0.1% hydrogen fluoride, 0.1% ammonium fluoride, 0.6wt% fluorinated four Methylammonium, 2% by weight gallic acid and 72% by weight of ethylene glycol monoethyl ether.
- the content of citric acid and ammonium citrate is 35 wt% by mass, and the content ratio of citric acid to ammonium citrate is 10:1.
- the content of citric acid and ammonium citrate is 45 wt% by mass, and the content ratio of citric acid to ammonium citrate is 10:1.
- citric acid/ammonium citrate buffered water solution 2wt% styrene and maleic acid copolymer (minutes Amount 1500), 2% by weight of ethylene glycol, 1% by weight of ammonium fluoride and 5 wt% of sulfolane, 2% by weight of p-aminobenzoic acid and 48% by weight of propylene glycol monobutyl ether.
- the content of citric acid and ammonium citrate is 5% by mass, and the content ratio of citric acid to ammonium citrate is 10:1.
- the content of citric acid and ammonium citrate is 55 wt% by mass, and the content ratio of citric acid to ammonium citrate is 10:1.
- citric acid/ammonium citrate buffer solution the content of citric acid and ammonium citrate is 15% by mass, and the content ratio of citric acid to ammonium citrate is 10:1.
- citric acid/ammonium citrate buffered water solution 0.001% polyammonium methacrylate (molecular weight 1000), 0.008 ⁇ % ethylene glycol, 0.1% hydrogen fluoride, 0.891wt% p-hydroxyphenol and 69wt% l, 3- Ethyl-2-imidazolidinone.
- the content of citric acid and ammonium citrate is 25 wt% by mass, and the content ratio of citric acid to ammonium citrate is 10:1.
- citric acid/sodium citrate buffer the content of citric acid and sodium citrate is 10% by mass, and the content ratio of citric acid to ammonium citrate is 20:1.
- the content of citric acid and ammonium citrate is 5% by mass, and the content ratio of citric acid to ammonium citrate is 20:1.
- Cleaning agent 1 24.55wt% citric acid / tetramethylammonium citrate buffered water solution (22.09wt% water, 2.37wt% tetramethylammonium citrate and 0.09wt% citric acid), 0.15%% hydroxyindole polyethyl ether (molecular weight 1000), 0.3 wt% benzotriazole, 0.5% ethylene glycol, 1.5%% fluorinated hinge and 73 wt% N-methylpyrrolidone.
- Cleaning agent 2 24.55wt% citric acid / tetraethylammonium citrate buffered aqueous solution (22.09wt% water, 2.37wt% tetraethylammonium citrate and 0.09wt% citric acid), 0.15%% hydroxyl-containing polyethyl ether ( Molecular weight 1000), 0.3wt% 4-carboxybenzotriazole, 0.5wt% ethylene glycol, 10 wt% 1, 3-dimethyl-2-imidazolidinone and 63 wt% N-methylpyrrolidone.
- Cleaning agent 3 34.55 wt% citric acid / tetraethylammonium citrate buffered aqueous solution (31.09 wt% water, 3.33 wt% tetraethylammonium citrate and 0.13 wt% citric acid), 0.15 ⁇ /. Hydroxy-containing polyethyl ether (molecular weight L000), 0.3 wt% methylbenzotriazole, 0.5 wt% ethylene glycol, 1.5% ammonium fluoride and 63 wt% N-methylpyrrolidone.
- the cleaning agents 1 to 3 were tested for metal and non-metal corrosion rates as follows. The test results are shown in Table 1.
- the cleaning liquid composition of the present invention has a corrosion rate for metals (such as metal aluminum) and non-metal (such as PETEOS) used in semiconductor fabrication, which are close to or less than 2 angstroms normally required by the semiconductor industry. Every minute, it does not substantially erode the substrate.
- metals such as metal aluminum
- PETEOS non-metal
Description
一种清洗等离子刻蚀残留物的清洗液 技术领域
本发明涉及半导体制造工艺中一种清洗液,具体的涉及一种清洗等离子 刻蚀残留物的清洗液。 技术背景
在半导体元器件制造过程中, 光阻层的涂敷、 曝光和成像对元器件的图 案制造来说是必要的工艺步骤。在图案化的最后(即在光阻层的涂敷、成像、 离子植入和蚀刻之后)进行下一工艺步骤之前, 光阻层材料的残留物需彻底 除去。 在掺杂步骤中离子轰击会硬化光阻层聚合物, 因此使得光阻层变得 不易溶解从而更难于除去。 至今在半导体制造工业中一般使用两步法(干法 灰化和湿蚀刻) 除去这层光阻层膜。 第一步利用干法灰化除去光阻层 (PR) 的大部分; 第二步利用缓蚀剂组合物湿蚀刻 /清洗工艺清洗去除剩余的光阻 层。在第二步的清洗工艺过程中, 缓蚀剂组合物只能除去残留的聚合物光阻 层和无机物, 而不能损害金属层如铝层。
现有技术中典型的清洗液有以下几种: 胺类清洗液, 半水性胺基(非羟 胺类)清洗液和氟化物类清洗液。 其中, 前两类清洗液需要在高温(一般在 60°C到 80°C之间)下使用, 存在金属腐蚀速率较大的问题; 而现有的氟化物 类清洗液也存在一些缺陷, 如不能同时控制金属和非金属基材的腐蚀, 因蚀 刻率较大而造成通道特征尺寸改变, 进一步导致半导体结构改变, 以及清洗 操作窗口比较小等。
现有文献已公幵的清洗液也或多或少存在一些缺点: US 6,828,289公开
了一种清洗液, 其包括: 酸性缓冲液、 有机极性溶剂、 含氟物质和水, 且 pH 值在 3〜7之间, 其中的酸性缓冲液由有机羧酸或多元酸与所对应的铵盐组. . 成, 组成比例为 10: 1至 1 : 10之间, 但强调不能含有乙二醇类有机溶剂。 US 5 , 698, 503公开了一种含氟清洗液, 其大量使用乙二醇, 该清洗液的粘度 与表面张力都很大, 从而影响清洗效果。 US 5,972,862公开了一种含氟清洗 液, 其包括含氟物质、 弱酸、 弱碱和有机极性溶剂, pH为 7〜11, 由于其不 含有缓冲体系, 清洗效果不稳定, 存在多样的问题。
现有技术中, 使用的抑制剂通常为邻苯二酚和偏苯三酚等,这些抑制剂 不能同时控制金属以及氧化物的蚀刻速率; 同时对环境和人体健康有危害。
因此, 寻求可避免以上现有的技术缺陷, 既具有较强的清洗能力, 又能 满足对基材的低刻蚀率,较大操作窗口和环境友好等其它清洗要求的清洗液 成为半导体制造工艺领域亟待解决的问题。 发明概要
本发明的目的是为了解决现有离子刻蚀残留物清洗液清洗效果不佳或 不稳定, 对基材腐蚀性大, 操作窗口较小, 环境污染的问题, 而提供一种清 洗能力强, 具有低刻蚀率且安全无毒害的等离子刻蚀残留物清洗液。
本发明的清洗液含有下列成分:柠檬酸 /柠檬酸盐缓冲水溶液、高分子腐 蚀抑制剂、 抗冻剂、 氟化物和溶剂。
其中,所述的柠檬酸 /柠檬酸盐缓冲水溶液在清洗液中的含量较佳的为质 量百分比 15%〜56%; 所述的高分子腐蚀抑制剂的含量较佳的为质量百分比 0.0001%〜10%; 所述的抗冻剂的含量较佳的为质量百分比 0.0001%〜10%;
所述的氟化物的含量较佳的为质量百分比 0.01%〜3%;所述的溶剂的质量百 分比较佳的为质量百分比 40%〜80%。
本发明中,所述的柠檬酸 /柠檬酸盐缓冲水溶液中柠檬酸和柠檬酸盐的质 量百分比含量较佳的为 5%〜60%, 更佳的为 10%〜50%。 其中, 柠檬酸和 柠檬酸盐的比例可根据需要以任何比例进行,但须使所得最终清洗液能保持 均相。 所述的柠檬酸盐较佳的为柠檬酸与无机碱或季胺氢氧化物形成的盐; 其中, 无机碱如氨水和氢氧化钾等, 季胺氢氧化物如四甲基氢氧化铵和四乙 基氢氧化铵等。 多官能团的柠檬酸 /柠檬酸盐缓冲水溶液不仅具有缓冲功能, 还具有较强的螯合能力和清洗无机残留物的能力。
本发明中,所述的高分子腐蚀抑制剂较佳的选自含羟塞聚合物和含羧基 聚合物中的一种或多种。其中, 所述的含羟基聚合物较佳的为含羟基聚醚或 聚乙烯醇等; 所述的含羧基聚合物较佳的为含羧基聚醚、 聚马来酸酐、 聚丙 烯酸、 聚甲基丙烯酸、 丙烯酸与马来酸共聚物、 苯乙烯与丙烯酸共聚物、 苯 乙烯与马来酸共聚物、 丙烯腈与马来酸共聚物或上述化合物的铵盐、 钾盐或 钠盐等。 本发明的清洗液配方中的高分子腐蚀抑制剂, 可作为腐蚀抑制剂、 表面活性剂或螯合剂使用, 并且对环境和人体安全无害, 避免了传统的腐蚀 抑制剂, 如邻苯二酚和偏苯三酚等的污染, 同时其还可对金属和非金属起到 很好的腐蚀抑制作用。
本发明中,所述的抗冻剂可选自多元醇,如二元醇中的乙二醇和丙二醇, 三元醇中的丙三醇, 四元醇中的季戊四醇。 抗冻剂的使用可使得本发明的清 洗液在 -18°C的条件下存放两个月不结冰。 本发明的清洗液配方中, 抗冻剂 较佳使用量为质量百分比 0.0001%〜10%; 较少量的抗冻剂对清洗液表面张
力和溶液粘度影响都很小,不会影响对晶片的清洗功效,对基材基本无腐蚀。 本发明中,所述的氟化物较佳的为氟化氢和氟化氢与碱形成的盐中的一 种或多种, 如 HF、 N¾F、 N(CH3)4F或 N(CH2OH)3HF等。 其中, 所述的碱 较佳的为氨水、 季胺氢氧化物或醇胺。
本发明中, 所述的溶剂可选自亚砜、 砜、 咪唑烷酮、 吡咯垸酮、 咪唑啉 酮、 酰胺和醚中的一种或多种。 其中, 所述的亚砜较佳的为二乙基亚砜或甲 乙基亚砜; 所述的砜较佳的为甲基砜、 乙基砜或环丁砜; 所述的咪唑垸酮较 佳的为 2-咪唑垸酮、 1,3-二甲基 -2-咪唑垸酮或 1,3-二乙基 -2-咪唑垸酮; 所述 的吡咯垸酮较佳的为 N-甲基吡咯垸酮;所述的咪唑啉酮较佳的为 1,3-二甲基 -2-咪唑啉酮 (DMI); 所述的酰胺较佳的为二甲基甲酰胺; 所述的醚较佳的 为乙二醇单甲醚、 乙二醇单乙醚、 乙二醇单丁醚、 二乙二醇单甲醚、 二乙二 醇单乙醚、二乙二醇单丁醚、丙二醇单甲醚、丙二醇单乙醚、丙二醇单丁醚、 二丙二醇单甲醚、 二丙二醇单乙醚或二丙二醇单丁醚。
本发明的清洗液还可含有小分子抑制剂,其含量较佳的为小于或等于质 量百分比 10%。所述的小分子抑制剂可选自酚类, 如苯酚、 1,2-二羟基苯酚、 对羟基苯酚或连苯三酚等; 羧酸类, 如苯甲酸、 对氨基苯甲酸(PABA)、 邻 苯二甲酸 (PA) 或没食子酸 (GA) 等; 羧酸酯类, 如对氨基苯甲酸甲酯、 邻苯二甲酸甲酯或没食子酸丙酯等; 酸酐类, 如乙酸酐或己酸酐等; 苯并三 氮唑类, 如苯并三氮唑、 甲基苯并三氮唑或 4-羧基苯并三氮唑等; 膦酸类如 1,3- (羟乙基) -2,4,6-三膦酸 (HEDPA)、 氨基三亚甲基膦酸 (ATMP) 或 2- 膦酸丁垸 -1, 2, 4-三羧酸 (PBTCA) 等; 或膦酸酯类等缓蚀剂中的一种或 多种。
本发明的清洗液由上述成分简单混合均匀即可使用。该清洗液可适用于 批量浸泡式、批量旋转式或单片旋转式处理器等多种清洗仪器和清洗方式中 使用。 并且, 本发明的清洗液可在较大的温度范围内使用, 一般可在室温到
45°C范围内使用。
本发明所用试剂及原料均市售可得。
本发明的积极进步效果在于:
( 1 ) 本发明的清洗液的清洗半导体制造过程中等离子刻蚀残留物具有 较高的清洗效力。 本发明清洗液配方中, 采用了多官能团的柠檬酸 /柠檬酸 盐缓冲水溶液, 其不仅具有缓冲功能, 还具有较强的螯合能力, 保证了清洗 液清洗功效的高效和稳定。
(2) 本发明的清洗液对非金属和金属基材, 如 Si、 Si02、 四乙氧基硅烷 二氧化硅(PETEOS) 、 低介质材料、 Ti、 A1和 Cu等, 均具有较低的蚀刻速 率。 本发明的清洗液可在较大的温度范围内使用, 一般在室温到 45°C范围内 使用, 因此可避免现有技术中因使用温度较高而引起的较高的金属腐蚀速 率。本发明清洗液配方中采用的高分子腐蚀抑制剂能同时对金属和非金属起 到很好的腐蚀抑制作用。
(3 ) 本发明的清洗液对环境和人体安全友好, 无污染危害。 本发明清 洗液配方中采用了高分子腐蚀抑制剂, 其具有高效腐蚀抑制作用, 同时也对 环境和人体无毒害,避免了采用邻苯二酚和偏苯三酚等传统腐蚀抑制剂所带 来的污染危害。
本发明的清洗液耐低温性能优,可在 -18°C的条件下存放两个月不结冰, 且抗冻剂在其较佳的用量范围内对清洗液表面张力和溶液粘度影响都很小,
不会影响对晶片的清洗功效, 对基材也基本无腐蚀作用。 发明内容
下面通过实施例的方式进一步说明本发明,但并不因此将本发明限制在 所述的实施例范围之中。
实施例 1
15wt%柠檬酸 /柠檬酸铵缓冲水溶液, 0.0001 wt%含羟塞聚乙基醚 (分子 量 1000), 5wt%乙二醇, 2wt%氟化铵和 77.9999 %环丁砜。
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比 5wt%, 柠檬酸和柠檬酸铵的含量比为 10: 1。
实施例 2
柠檬酸 /柠檬酸四甲铵缓冲液中,柠檬酸和柠檬酸四甲铵的含量为质量百 分比 60wt%, 柠檬酸和柠檬酸四甲铵的含量比为 1 : 1。
实施例 3
15wt%柠檬酸 /柠檬酸四乙铵缓冲水溶液, lwt%聚乙烯醇共聚物 (分子 量 3000), lwt%季戊四醇, 2wt%氟化四甲铵, lwt%氨基三亚甲基膦酸和 80wt% N-甲基吡咯垸酮 (NMP)。
柠檬酸 /柠檬酸四乙铵缓冲液中,柠檬酸和柠檬酸四乙铵的含量为质量百 分比 10wt%, 柠檬酸和柠檬酸四乙铰的含量比为 1 : 30。
实施例 4
15wt%柠檬酸 /柠檬酸钾缓冲水溶液, 10^%含羧基聚乙基醚 (分子量 1000) ), 10wt%乙二醇, 0.01wt%氟化四乙铵, lwt%l,3- (羟乙基) -2,4,6- 三膦酸和 63.99wt%l,3-二甲基 -2-咪唑啉酮 (DMI)。
柠檬酸 /柠檬酸钾缓冲液中, 柠檬酸和柠檬酸钾的含量为质量百分比 50wt%, 柠檬酸和柠檬酸钾的含量比为 10: 1。
实施例 5
30wt%柠檬酸 /柠檬酸钠缓冲水溶液, 3^%含羟基聚乙基醚 (分子量 1000), 2wt%含羧基聚乙醚(分子量 1000), 0.0001 %乙二醇, 0.5wt%氟化 氢, 0.5 %氟化四甲铵,. 1^%乙酸酐和 62.9999wt%2-咪唑垸酮。
柠檬酸 /柠檬酸钠缓冲液中, 柠檬酸和柠檬酸钠的含量为质量百分比 20wt%, 柠檬酸和柠檬酸钠的含量比为 20: 1。
实施例 6
40wt%柠檬酸 /柠檬酸铵缓冲水溶液, 0.001wt%聚马来酸酐 (分子量 600), lwt%乙二醇, lwt%N(CH2OH)3HF, 1^%氟化氢, lwt%没食子酸丙 酯和 55.999wt%甲乙基亚砜。
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比 40wt%, 柠檬酸和柠檬酸铵的含量比为 10: 1。
实施例 7
50wt%柠檬酸 /柠檬酸铵缓冲水溶液, 0.01^%聚丙烯酸 (分子量 700), 0.001^%乙二醇, 2wt%氟化氢, 5wt%邻苯二甲酸甲酯和 42.989wt%l,3-二 甲基 -2-咪唑垸酮。
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比
15wt%, 柠檬酸和柠檬酸铵的含量比为 25: 1。
实施例 8
20wt%柠檬酸 /柠檬酸铵缓冲水溶液, 0.1wt%聚甲基丙烯酸 (分子量 700), 0.01^%乙二醇, 2.5 %氟化铵, 8wt%对氨基苯甲酸甲酯和 69.39wt% 二甲基甲酰胺。
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比 25wt%, 柠檬酸和柠檬酸铵的含量比为 10: 1。
实施例 9
25wt%柠檬酸 /柠檬酸铵缓冲水溶液, 0.1^%丙烯酸与马来酸共聚物(分 子量 1000), 0.1wt%乙二醇, 0.1^%氟化氢, 0.1 %氟化铵, 0.6wt%氟化四 甲基铵, 2wt%没食子酸和 72^%乙二醇单乙醚。
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比 35wt%, 柠檬酸和柠檬酸铵的含量比为 10: 1。
实施例 10
30wt%柠檬酸 /柠檬酸铵缓冲水溶液, 1^%苯乙烯与丙烯酸共聚物 (分 子量 1500), 4^%乙二醇, 4wt%丙三醇, 1^%氟化氢, 5wt%邻苯二甲酸, 30wt%l,3-二甲基 -2-咪唑啉酮和 25wt%二丙二醇单丁醚。
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比 45wt%, 柠檬酸和柠檬酸铵的含量比为 10: 1。
实施例 11
40wt%柠檬酸 /柠檬酸铵缓冲水溶液, 2wt%苯乙烯与马来酸共聚物 (分
子量 1500), 2^%乙二醇, lwt%氟化铵和 5wt%环丁砜, 2wt%对氨基苯甲 酸和 48^%丙二醇单丁醚。
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比 5wt%, 柠檬酸和柠檬酸铵的含量比为 10: 1。
实施例 12
56wt%柠檬酸 /柠檬酸铵缓冲水溶液, 0.5^%丙烯腈与马来酸共聚物(分 子量 1000), 0.5 %聚丙烯酸(分子量 700), 0.5 %乙二醇, 0.1\^%氟化氢, 0.4^%苯甲酸和 42wt%二乙二醇单甲醚。
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比 55wt%, 柠檬酸和柠檬酸铵的含量比为 10: 1。
实施例 13
20wt%柠檬酸 /柠檬酸铵缓冲水溶液, 0.5^%丙烯酸与马来酸共聚物(分 子量 1000), 2.5wt%乙二醇, 3^%氟化铵, 4wt%连苯三酚和 70wt%二丙二 醇单甲醚。
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比 15wt%, 柠檬酸和柠檬酸铵的含量比为 10: 1。
实施例 14
30wt%柠檬酸 /柠檬酸铵缓冲水溶液, 0.001^%聚甲基丙烯酸铵(分子量 1000), 0.008^%乙二醇, 0.1^%氟化氢, 0.891wt%对羟基苯酚和 69wt%l,3- 二乙基 -2-咪唑烷酮。
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比 25wt%, 柠檬酸和柠檬酸铵的含量比为 10: 1
实施例 15
15wt%柠檬酸 /柠檬酸钠缓冲水溶液, 0.1^%丙烯酸与马来酸共聚物(分 子量 1000), 0.1wt%聚丙烯酸钾(分子量 1000),
氟化铵, 5wt%l;2-二羟基苯酚, 5wt%2-膦酸丁垸 -1, 2, 4-三羧酸甲酯和 66.8wt %二 丙二醇单乙醚。
柠檬酸 /柠檬酸钠缓冲液中, 柠檬酸和柠檬酸钠的含量为质量百分比 10wt%, 柠檬酸和柠檬酸铵的含量比为 20: 1。
实施例 16
柠檬酸 /柠檬酸铵缓冲液中, 柠檬酸和柠檬酸铵的含量为质量百分比 5wt%, 柠檬酸和柠檬酸铵的含量比为 20: 1。
效果实施例
清洗剂 1 24.55wt%柠檬酸 /柠檬酸四甲基铵缓冲水溶液 (22.09wt%水、 2.37wt%柠檬酸四甲基铵和 0.09wt%柠檬酸), 0.15^%含羟棊聚乙基醚 (分 子量 1000), 0.3wt%苯并三氮唑, 0.5 %乙二醇, 1.5^%氟化铰和 73wt%N- 甲基吡咯垸酮。
清洗剂 2 24.55wt%柠檬酸 /柠檬酸四乙基铵缓冲水溶液 (22.09wt%水、 2.37wt%柠檬酸四乙基铵和 0.09wt%柠檬酸), 0.15^%含羟基聚乙基醚 (分 子量 1000), 0.3wt%4-羧基苯并三氮唑, 0.5wt%乙二醇,
10wt% 1, 3-二甲基 -2-咪唑啉酮和 63wt% N_甲基吡咯垸酮。
清洗剂 3 34.55wt%柠檬酸 /柠檬酸四乙基铵缓冲水溶液 (31.09wt%水、 3.33wt%柠檬酸四乙基铵盐和 0.13wt%柠檬酸), 0.15^/。含羟基聚乙基醚(分 子量 L000 ) , 0.3wt%甲基苯并三氮唑, 0.5wt%乙二醇, 1 .5^%氟化铵和 63wt%N-甲基吡咯垸酮。
按下述方法对清洗剂 1~3进行对金属和非金属腐蚀速率的测试,测试结 果如表 1所示。
1. 溶液的金属腐蚀速率测试方法:
. 1 )利用 Napson四点探针仪测试 4*4cm铝空白硅片的电阻初值 (Rsl );
2) 将该 4*4cm铝空白硅片浸泡在预先己经恒温到 35°C的溶液中 30分 钟;
3 ) 取出该 4*4cm铝空白硅片, 用去离子水清洗, 高纯氮气吹干, 再利 用 Napson四点探针仪测试 4*4cm铝空白硅片的电阻值 (Rs2);
4) 重复第二和第三步再测试一次, 电阻值记为 Rs3;
5 ) 把上述电阻值和浸泡时间输入到合适的程序可计算出其腐蚀速率。
2. 溶液的非金属腐蚀速率测试方法:
1 ) 利用 Nanospec6100测厚仪测试 4*4cm PETEOS硅片的厚度 (T1 );
2)将该 4*4cmPETEOS硅片浸泡在预先已经恒温到 35°C的溶液中 30分 钟;
3 ) 取出该 4*4cmPETEOS硅片, 用去离子水清洗, 高纯氮气吹干, 再 利用 Nanospec6100测厚仪测试 4*4cmPETEOS硅片的厚度 (T2);
4) 重复第二和第三步再测试一次厚度记为 T3 ;
5 ) 把上述厚度值和浸泡时间输入到合适的程序可计算出其腐蚀速率。
表 1 清洗剂 1〜3腐蚀速率测试结果
从表 1中可以看出: 本发明的清洗液组合物对半导体制成中所用的金属 (如金属铝) 和非金属 (如 PETEOS) 的腐蚀速率均接近或小于半导体业界 通常所要求的 2埃每分钟, 基本不会侵蚀基材。
用表 1中的溶液对等离子刻蚀残留物进行清洗发现,其等离子刻蚀残留 物均被去除, 而且基本没有腐蚀金属和非金属。
Claims
1.一种清洗等离子刻蚀残留物的清洗液,其特征在于含有:柠檬酸 /柠檬 酸盐缓冲水溶液、 高分子腐蚀抑制剂、 抗冻剂、 氟化物和溶剂。
2.如权利要求 1所述的清洗液,其特征在于:所述的柠檬酸 /柠檬酸盐缓 冲水溶液在清洗液中的含量为质量百分比 15%〜56%。
3.如权利要求 1所述的清洗液, 其特征在于: 所述的柠檬酸盐为柠檬酸 与无机碱或季胺氢氧化物形成的盐。
4.如权利要求 3所述的清洗液, 其特征在于: 所述的无机碱为氨水或氢 氧化钾; 所述的季胺氢氧化物为四甲基氢氧化铵或四乙基氢氧化铵。
5.如权利要求 1所述的清洗液,其特征在于:所述的柠檬酸 /柠檬酸盐缓 冲水溶液中柠檬酸和柠檬酸盐的含量为质量百分比 5%〜60%。
6.如权利要求 5所述的清洗液,其特征在于:所述的柠檬酸 /柠檬酸盐缓 冲水溶液中柠檬酸和柠檬酸盐的含量为质量百分比 10%〜50%。
7.如权利要求 1所述的清洗液, 其特征在于: 所述的高分子腐蚀抑制剂 或抗冻剂的含量为质量百分比 0.0001%〜10%。
8.如权利要求 1所述的清洗液, 其特征在于: 所述的抗冻剂为多元醇中 的一种或多种。
9.如权利要求 8所述的清洗液, 其特征在于: 所述的多元醇为乙二醇、 丙三醇或季戊四醇。
10.如权利要求 1所述的清洗液,其特征在于:所述的高分子腐蚀抑制剂 为含羟基聚合物和含羧基聚合物中的一种或多种。
11.如权利要求 10所述的清洗液, 其特征在于: 所述的含羟基聚合物为 含羟基聚醚或聚乙烯醇; 所述的含羧基聚合物为含羧基聚醚、 聚马来酸酐、 聚丙烯酸、聚甲基丙烯酸、丙烯酸与马来酸共聚物、苯乙烯与丙烯酸共聚物、 苯乙烯与马来酸共聚物、 丙烯腈与马来酸共聚物或上述化合物的铰盐、钾盐 或钠盐。
12.如权利要求 1所述的清洗液,其特征在于:所述的氟化物的含量为质 量百分比 0.01%〜3%。
B.如权利要求 1所述的清洗液,其特征在于:所述的氟化物为氟化氢和 氟化氢与碱形成的盐中的一种或多种。
14.如权利要求 13所述的清洗液, 其特征在于: 所述的碱为氨水、 季胺 氢氧化物或醇胺。
15.如权利要求 1所述的清洗液,其特征在于:所述的溶剂的含量为质量 百分比 40%〜80%。
16.如权利要求 1所述的清洗液, 其特征在于: 所述的溶剂为亚砜、 砜、 咪唑垸酮、 吡咯垸酮、 咪唑啉酮、 酰胺和醚中的一种或多种。
17.如权利要求 16所述的清洗液, 其特征在于: 所述的亚砜为二甲基亚. 砜、 二乙基亚砜或甲乙基亚砜; 所述的砜为甲基砜、 乙基砜或环丁砜; 所述 的咪唑垸酮为 2-咪唑烷酮、 1,3-二甲基 -2-咪唑垸酮或 1,3-二乙基 -2-咪唑垸酮;. 所述的吡咯垸酮为 N-甲基吡咯垸酮; 所述的咪唑啉酮为 1,3-二甲基 -2-咪唑 啉酮; 所述的酰胺为二甲基甲酰胺; 所述的醚为乙二醇单甲醚、 乙二醇单乙 醚、 乙二醇单丁醚、 二乙二醇单甲醚、 二乙二醇单乙醚、 二乙二醇单丁醚、 丙二醇单甲醚、 丙二醇单乙醚、 丙二醇单丁醚、 二丙二醇单甲醚、 二丙二醇 单乙醚或二丙二醇单丁醚。 .
18.如权利要求 1所述的清洗液,其特征在于:所述的清洗液还含有小分 子抑制剂。
19.如权利要求 18所述的清洗液, 其特征在于: 所述的小分子抑制剂的 含量为小于或等于质量百分比 10%。
20.如权利要求 18所述的清洗液, 其特征在于: 所述的小分子抑制剂选 自酚类、 羧酸类、 羧酸酯类、 酸酐类、 苯并三氮唑类、 膦酸类和膦酸酯类缓 蚀剂中的一种或多种。
21.如权利要求 20所述的清洗液,其特征在于: 所述的酚类为苯酚、 1,2- 二羟基苯酚、 对羟基苯酚或连苯三酚; 所述的羧酸类为苯甲酸、 对氨基苯甲
酸、 邻苯二甲酸或没食子酸; 所述的羧酸酯类为对氨基苯甲酸甲酯、 邻苯二 甲酸甲酯或没食子酸丙酯; 所述的酸酐类为乙酸酐或己酸酐; 所述的苯并三 氮唑类为苯并三氮唑、 甲基苯并三氮唑或 4-羧基苯并三氮唑; 所述的磷酸类 为 1,3- (羟乙基) -2,4,6-三膦酸、 氨基三亚甲基膦酸或 2-膦酸丁垸 -1, 2, 4- 三羧酸。
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